/* Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.explorer.ui.task;

import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.data.Property.ValueChangeListener;
import com.vaadin.event.LayoutEvents.LayoutClickEvent;
import com.vaadin.event.LayoutEvents.LayoutClickListener;
import com.vaadin.ui.CssLayout;
import com.vaadin.ui.DateField;
import com.vaadin.ui.Label;
import org.activiti.engine.TaskService;
import org.activiti.engine.task.Task;
import org.activiti.explorer.I18nManager;
import org.activiti.explorer.Messages;
import org.activiti.explorer.ui.custom.PrettyTimeLabel;
import org.activiti.explorer.ui.mainlayout.ExplorerLayout;

import java.util.Date;


/**
 * @author Joram Barrez
 */
public class DueDateComponent extends CssLayout {


    private static final long serialVersionUID = 1L;
    protected Task task;
    protected I18nManager i18nManager;
    protected transient TaskService taskService;

    protected Label dueDateLabel;
    protected DateField dueDateField;

    public DueDateComponent(final Task task, final I18nManager i18nManager, final TaskService taskService) {
        this.task = task;
        this.i18nManager = i18nManager;
        this.taskService = taskService;

        setSizeUndefined();
        initDueDateLabel();
        initDueDateField();
        initLayoutClickListener();
        initDueDateFieldListener();
    }

    protected void initDueDateLabel() {
        dueDateLabel = new PrettyTimeLabel(i18nManager.getMessage(Messages.TASK_DUEDATE_SHORT),
                task.getDueDate(), i18nManager.getMessage(Messages.TASK_DUEDATE_UNKNOWN), false);
        dueDateLabel.addStyleName(ExplorerLayout.STYLE_TASK_HEADER_DUEDATE);
        dueDateLabel.setSizeUndefined();
        dueDateLabel.addStyleName(ExplorerLayout.STYLE_CLICKABLE);
        addComponent(dueDateLabel);
    }

    protected void initDueDateField() {
        dueDateField = new DateField();
        if (task.getDueDate() != null) {
            dueDateField.setValue(task.getDueDate());
        } else {
            dueDateField.setValue(new Date());
        }
        dueDateField.setWidth(125, UNITS_PIXELS);
        dueDateField.setResolution(DateField.RESOLUTION_DAY);
        dueDateField.setImmediate(true);
    }

    protected void initLayoutClickListener() {
        addListener(new LayoutClickListener() {
            public void layoutClick(LayoutClickEvent event) {
                if (event.getClickedComponent() != null && event.getClickedComponent().equals(dueDateLabel)) {
                    // replace label with textfield
                    replaceComponent(dueDateLabel, dueDateField);
                }
            }
        });
    }

    protected void initDueDateFieldListener() {
        dueDateField.addListener(new ValueChangeListener() {
            public void valueChange(ValueChangeEvent event) {
                if (dueDateField.getValue() != null) {
                    // save new duedate
                    task.setDueDate((Date) dueDateField.getValue());
                    taskService.saveTask(task);

                    // replace with new label
                    dueDateLabel.setValue(task.getDueDate());
                    replaceComponent(dueDateField, dueDateLabel);
                }
            }
        });
    }

}
